Children don’t remember much before the age of 3, due to what psychologists call “infantile amnesia.” Neuroscientists believe that early experiences never make it into long-term memory banks because the brain’s recording machinery isn’t functional yet or because...

Babies are not born with psychic tearing, or tears that indicate emotional distress, though they are born with basal tearing (enough tears to keep the eyes moist and healthy) and reflex tearing (tears that respond to an irritant). Between 2 and 4 months of age, a baby...